Flight Control Panels

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API Documentation: Flight Control Panel API

Description

• ELAC (Elevator Aileron Computer)
  • Normally, ELAC 1 commands the operation of the ailerons and ELAC 2 commands the operation of the elevators and horizontal stabilizer. ELAC 1 and 2 perform the following:
    • Normal pitch and roll, normal LAF (Load Alleviation Function).
    • Alternate pitch, alternate LAF.
    • Direct pitch and roll.
    • Aileron droop.
    • Abnormal attitude.
    • Acquisition of autopilot orders.
• SEC (Spoiler Elevator Computer)
  • The Spoiler Elevator Computers 1, 2, and 3 command spoiler operation. The SECs control the following.
    • Normal roll by controlling the spoilers.
    • Speed brakes and ground spoilers.
    • Alternate pitch (SEC 1 and SEC 2 only).
    • Direct pitch (SEC 1 and SEC 2 only).
    • Alternate LAF.
    • Abnormal attitude.
    • Direct roll.
• FAC (FlIGHT Augmentation Computer)
  • The Flight Augmentation Computers have three main functions:
    • Rudder trim.
    • Rudder travel limits.
    • Yaw damping inputs.
    • Alternate yaw.
    • Flight envelope and speed computations.
    • Wind shear detection.

Usage

• ON:

  • When the associated flight control computer switch is ON, it engages the computer and lights are extinguished. This is the normal position.

• OFF:

  • When selected to OFF, the OFF light illuminates white and disengages the associated computer.

• RESET:

  • You can reset a computer by turning the computer OFF then ON.

• FAULT:

  • The associated FAULT Light illuminates amber:
    • When a failure is detected.
    • During computer's power-up test (8-second duration). This test occurs for each flight control computer upon electrical power application or after electrical transient/interruption.
    • The FAULT light extinguishes when OFF is selected or at completion of satisfactory power-up test.

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Last update: August 12, 2023